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This CL moves some interfaces for context menu under
chrome/browser/contextmenu and defines a new modularized target.

This allows TabDelegateFactory class to chrome/browser/tab, and
put |TabImpl.updateAttachment| back to Tab interface.

Bug: 952703
Change-Id: Ie5534ce07c8e84593e6033141501e3f3a0ba4704
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2201796Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770805}